Device for cutting screws upon long rods.



No. 813 114. PATENTED FEB. 20, 1906 'P. PREUS$.

DEVICE FOR CUTTING SCREWS UPON LONG RODS.

APPLICATION FILED MAEJO. 1905.

. UNITED srA'rEs P T N orrron v riot realise; or henna, GERMANY. f

nevao-Fon ou-fi rme s onl-zws UPON Lowe Rosa] l l Specification ofLettei s Patent. Application filed March 10,1905. Serial No. 249,481.

Patented Feb. 20, race.

To all whfom it may concern.-

Be it known that I, PAUL PnEUss, a subject of the King of Prussia,German Emperor, residing at No. 69 Wrangel street, in the city ofBerlin, in the Kingdom of Prussia, German Empire, have invented a newand Improved Device for Cutting Screws upon Long Bods, of which-thefollowing is a specification.

" To cut screws upon long rods andthe like,

thread-cutting lathes, as well as screw-plates,;

have been employed since a long time, particularly where the threadalthough tolerabiy useful was more of a cheap than of an exact nature.In both these cases, however, the rods became deformed by the unequalpressing during the cutting and by the mechanical influence upon theouter fibers of the material, and thus the rods had to be restraightenedafter the cutting, which was pretty much laborious, particularly wherethreads of precise make were re uired. These drawbacks are done awaywith by my improved cuttin -tool, as represented in the accompanymgrawings, 1n WhlQhv'" Figure 1 1s a longitudinal section through saiddevice. Fig. 2 is across-section'in line 5 6 of Fig. 1. Fig. 3 is across-section similar to Fig. 2, showing a slightly-modified form ofFig.4 a cross-section in line 78ofFig1.

The sleeve 0 consists of a tube-like portion adapted to be fixed to thechuck of a suitable lathe and of a widenedportion ada ted to receive thecutting-tool proper, b. e bore of the narrow portion of this rotarysleeve corresponds to the outer diameter of the thread i to be cut,andthe bore of another sleeve 0,

adapted to be screwed upon the sleeve a, corresponds to the outerdiameter of the stationary rod to be threaded, f,,so that the rod fisguided as well as kept straight by theiiarrow portions of the sleevesand their-bores'. The

sleeve'c is-provided with a nut e, takm around the rod f, and betweenthe arts 0 and e is located a rose-bit (1, Figs. 1 an 2,..(0r arearranged knives d, Fig. 3,).whichsnyoothes the surface of the rod andmakes it fit to receive the thread. The rough bar is pressed against therose-bit just by the action of the tool 5 upon the thread it has cut, sothat a special feeding device can be dispensed with.-

Apertures 9 allow of the chips leaving the casing formed by the widenedportions-of the and scrapers h remove the p v tool. another sleeveattached to said widened.

sleeves a and c,

straight the rod to a bore in :tary chuck of a suita Having nowdescribed my invention, what I desire to secure by a patent of theUnited States is' '1. In a device for cutting screws upon long rods, thecombination with a sleeve 0, having a narrow portion adapted to be fixedto the rotaryehuck of a suitable lathe, and a widened portion adapted toreceive the threading- -tool, another sleeve attached to said widenedportion, and having also a narrow portion, a bore in each of the twonarrow portions ada ted to receive, to guide, and to kee be threaded,and thread ing-tools located within the space inclosed by the twowidened portions of the sleeves, and secured to thefirst-mentioned'sleeve, substantially and for the purposeas described.

2. In a device for cuttlng screws upon long rods, the combination with asleeve a having a narrowpo'rtion adapted to befixed to the rotary chuckof a suitable lathe and awidened portion adapted to receive thethreadingtool, another sleeve attached to said widened portion, andhaving also a narrow portion, a bore in each of the two narrow portionsadapted receive, to guide, straight the rod to be threaded, toolslocated within the space inclosed by the two widened portions of thesleeves, and se cured to the first-mentioned sleeve, .a rodsmoothlngtool secured to the narrow, ortir of the other sleeve, and a nutattached to the latter and adapted to hold this tool in place,substantially and for the purpose as described.

and to keep threading-'- 3. In a device for cuttlng screws upon longrods, the combination with a sleeve a'having anarrow ortion adapted tobefixed to the rotary chuc of a suitable lathe, and a widened portionadapted to receive the threadingtool, another sleeve attached to saidwidened portion, and having also a narrow portion, each of the twonarrow portions adapted to receive, to guide, and to keep straight therod to be threaded, threadingtools'located within the space inclosed bythe two widened portions of the sleeves, and secured to thefirst-mentioned sleeve, and scra ers secured to the outer end of thebore of t e latter, substantially and for the purpose as described.

4. In a device for cutting screws upon long rods, the combination with asleeve at having anarrow portion ada ted to befixed to the role lathe,and a widened ortion adapted to receive thethreadingportion, and havingalso a narrow portion, and scrapers secured to the outer end of the abore in each of the two narrow portions l first sleeve, substantiallyand for the purpose adapted to receive, to guide, and to keep asdescribed. strai ht the rod to be threaded, threading- In Witnesswhereof I have hereunto set my 5 tools located Within the space inclosedby the hand in presence of two Witnesses.

two widened portions of the sleeves, and secured to the first-mentionedsleeve, a r0d Y smoothing toolsecured t0 the narrow por- Witnesses: tionof the other sleeve, a nutattaehed t0 the HENRY HAsPER, 10' latter, and.adapted to holclthis tool; in place VVOLDEMAR HAUPT.

PAU L PREUSS.

